The 22.5 degree description in Kato's reference is not the radius. It only means each section only covers 22.5 degrees of the circle. 360 degrees in a circle so it takes 16 sections (16 X 22.5 = 360) to make a complete circle. Kato has many different radius curved sections. When you look at the description it should read something like R790 - 22.5degree (790mm or 31 1/8"radius) for one example. They make all the way up to 867mm radius (34").
